Affiliation: | 1. Department of Surgery and Cancer, Imperial College Healthcare NHS Trust, London, UK 2. Department of Gastroenterology, Trafford General Hospital, Manchester, UK 3. Department of Surgery and Cancer, Imperial College Healthcare NHS Trust, London, UK 4. The West London Renal and Transplant Centre, Imperial College Healthcare NHS Trust Hammersmith Hospital, Du Cane Road, London, W12 0QT, UK
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